How to bleed and replace brake fluid on a 2009 Yamaha Grizzly 550 4X4
Shop parts for a 2009 Yamaha Grizzly 550 4X4 ATV.
This guide from MotoSport covers the tools, safety, model-specific notes, step-by-step procedure and troubleshooting for draining, replacing and bleeding the hydraulic brake system on a 2009 Yamaha Grizzly 550 4X4. Follow each step carefully and work cleanly to avoid contamination of the system.
What you need
- DOT 4 brake fluid – Yamaha specification (use only fresh, sealed fluid)
- Brake bleeding kit or clear hose and catch bottle
- Turkey baster or fluid siphon
- Wrenches for bleed nipples (usually 8 mm or 10 mm) and reservoir cap tool
- Rags, gloves & safety glasses
- Torque wrench for caliper/hose fasteners (recommended for reinstallation)
- Jack or ramps and stands to safely lift the ATV (if needed)
- Brake cleaner and a disposable container for used fluid
Model-specific notes for the 2009 Yamaha Grizzly 550 4X4
- The Grizzly 550 uses a hydraulic disk brake system front and rear with a master cylinder reservoir typically located near the handlebars for front brakes and a separate reservoir or combined line for rear brakes depending on factory configuration. Confirm reservoir locations before starting.
- Use DOT 4 brake fluid unless your owner’s manual specifies otherwise. Do not mix DOT 4 with DOT 5 silicone fluid.
- The Grizzly can have a linked brake system on some trims — if your machine features linked brakes, bleed the linked circuit as a unit following the order below. If unlinked, treat front and rear separately.
- Brake lines and fittings on this model are OEM steel/banjo fittings; inspect for corrosion or damage and replace any compromised components before bleeding.
Preparation
- Work in a well-ventilated, clean area out of direct sunlight. Keep rags handy to wipe spills immediately; brake fluid damages paint and plastics.
- Park the ATV on level ground, set parking brake, and disconnect the negative battery terminal if you’re going to operate electrical components while bleeding.
- Remove wheels if necessary for access to calipers. Secure the ATV on stands if wheels are off.
- Clean around the reservoir cap and bleed nipples to prevent dirt entry.
Drain the old fluid from the reservoir
- Open the reservoir cap and carefully remove the diaphragm/foam pad. Use a turkey baster or fluid siphon to remove as much old fluid as possible from the reservoir.
- Refill the reservoir with fresh DOT 4 to the fill line. Do not overfill.
Bleeding order (general for Grizzly 550)
Start with the caliper farthest from the master cylinder and work toward the nearest. Typical order:
- Rear-right (if rear on same circuit)
- Rear-left
- Front-right
- Front-left
If your Grizzly has a linked system, follow the manufacturer bleed order printed on the reservoir cap or in the service manual; if unsure, follow the farthest-to-nearest method above.
Manual (two-person) bleeding method
- Attach a clear hose to the bleed nipple on the caliper you’re starting with. Submerge the other end in a container partially filled with fresh brake fluid to prevent air re-entry.
- Have an assistant slowly depress the brake lever/pedal several times, then hold firm at the end of the stroke.
- Open the bleed nipple about a quarter turn until fluid and bubbles flow into the hose. Close the nipple before the assistant releases the lever/pedal. Repeat until no air bubbles are visible and the fluid runs clear.
- Top up the master cylinder reservoir after each caliper until full but not overfilled.
- Repeat for each caliper in the bleed order. Always close the bleed nipple before the lever is released to avoid sucking air back into the system.
- After all calipers are bled, pump the brake lever/pedal to build pressure and check for a firm feel. If it feels spongy, repeat bleeding focusing on the calipers with air or the farthest caliper again.
One-person (pressure or vacuum) bleeding
- Use a pressurized reservoir cap or vacuum pump on each bleed nipple per tool instructions. Maintain reservoir fluid level while pressurizing to prevent air entry.
- Follow the same bleed order and check for bubbles until clear fluid is delivered from each nipple.
Finishing up
- Wipe any spilled fluid immediately and inspect brake lines, banjo bolts and fittings for leaks. Torque fittings to OEM specs if available; otherwise tighten snugly but avoid over-torquing.
- Reinstall reservoir diaphragm and cap. Refit wheels and torque axle/wheel nuts to spec.
- Lower the ATV, reconnect battery if disconnected, and perform multiple brake applications at low speed in a safe area to bed the system in and verify full braking performance.
- Dispose of used brake fluid according to local hazardous-waste regulations.
Troubleshooting
- Persistent spongy brake pedal after multiple bleeds usually indicates remaining air, a soft seal, or internal master-cylinder issue — consider replacing the master cylinder or caliper seals if bleeding fails.
- If brake lever sinks slowly under pressure, check for internal leaks or reservoir-to-master leaks.
- Contaminated fluid (dark, oily or dirty) requires a complete flush of all lines and components; replace any rubber parts that show swelling or degradation.
Maintenance interval & tips
- Replace brake fluid every 1-2 years or sooner if you ride in wet or high-use conditions to avoid moisture buildup and corrosion.
- Inspect brake pads, rotor condition and caliper slide pins when bleeding. Replace worn pads and service sticky pins to ensure even braking.
- Keep a spare master cylinder cap diaphragm in your tool kit and always use sealed brake fluid containers to avoid moisture contamination.
MotoSport reminder – perform the job methodically, use the correct DOT 4 fluid, and replace any questionable hardware while the system is open. If you encounter internal master cylinder problems or persistent leaks, consult a professional mechanic or schedule service with a qualified shop that specializes in ATVs.
Related Shopping Categories
Shop Brake Fluid for a 2009 Yamaha Grizzly 550 4X4 ATV.
Shop Brake Bleeders for a 2009 Yamaha Grizzly 550 4X4 ATV.
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Shop Brake Lines for a 2009 Yamaha Grizzly 550 4X4 ATV.
Shop Brake Tools for a 2009 Yamaha Grizzly 550 4X4 ATV.
Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.